Question

Q.3 use suitable identity
(1) 0.98 x 0.95​

Answer 1

$0.98 \times 0.95 \\ \\ \frac{98}{100} \times \frac{95}{100} \\ \\ (98 \times 95) \frac{1}{10000} \\ \\ [(100 - 2)(100 - 5)] \frac{1}{10000} \\ \\ [ {(100)}^{2} + ( - 2 - 5)100 + ( - 2)( - 5)] \frac{1}{10000} \\ \\ [10000 - 700 + 10] \frac{1}{10000} \\ \\ (10010 - 700) \frac{1}{10000} \\ \\ \frac{9310}{10000} = 0.9310$